Messier M7 - Ptolemy's Cluster
M7, also known as the Ptolemy's Cluster, is located in the constellation Scorpius, and is best viewed during Mid-Summer.
Ptolemy's Cluster ...
M7 = NGC6475 (17h 53.9m -34°49´, 3.3 mag. )
M7 is visible with a naked eye on the backdrop of Milky Way about 4°30' NE of l Scorpii (see finder chart below).
M7 (NGC6475) is clearly the best open cluster of the constellation. This magnificent object is extremely large (about a size of 1 degree) and quite bright, being visible even to the naked eye at a viewpoint far from urban area.
TiI (see for instance the line at 5020) appears in late A-type stars and grows continuously toward later types. A positive luminosity effect exists. The most intense infrared line of TiI is that at 9638(32), which in the sun has W = 0.019.
M7 is 4º NNE of lambda Scorpii. It's about 800 light years away.
M80 (NGC 6093) is a rather faint, very compact, globular cluster in the vicinity of Antares, between this star and beta Scorpii, and more narrowly speaking, ...
Is this page a copy of Strobel's Astronomy Notes? Author of original content: Nick Strobel ...
M7 (NGC 6475, Ptolemy's Cluster)
M8 (NGC 6523, Lagoon Nebula)
M11 (NGC 6705, Wild Duck Cluster)
M13 (NGC 6205, Great Cluster in Hercules)
M16 (NGC 6611)
M17 (NGC 6618, Omega Nebula)
M20 (NGC 6514, Trifid Nebula) ...
A cluster of stars known as M7 sparkles like fireflies in this view from Kitt Peak National Observatory. The stars in the cluster are all members of the same family -- they were born about 220 million years ago from a single cloud of gas and dust.
5 or M7 Ve). It has about 13 percent of Sol's mass (Torres et al, 1999), with about 14 percent of its diameter but only 8/100,000th of its luminosity. Some of the star's dimness is probably due to sunspots which often lead to stellar flaring.
Another galactic cluster to be found in the rich hunting grounds of the constellation of Scorpius is M7, also known as Ptolemy's cluster. It is a large group of about 80 stars set against the background of fainter and more distant Milky Way stars.
Mira A, a red giant belonging to the spectral type M7 IIIe, is an oscillating variable star that serves as a prototype for an entire class of variables, the Mira variables. There are between 6,000 and 7,000 known stars belonging to this group.
Vladimir is a types of inhabited localities in Russia in Russia, located on the Klyazma River, to the east of Moscow along the M7 motorway . It is the administrative center of Vladimir Oblast....
in his favour.
Nebulae include Messier Objects M8, M16, M17, M20 and the Pipe Nebula. Open clusters include M6, M7, M18, M21, M23, M24, M25. Globular clusters include M9, M22, M28, M54, M69, M70. And don't forget Baade's Window.
The comet is located in Ophiuchus, and about halfway between M7 ("stinger of the Scorpion" and planet Mercury.
There are many open clusters, including the spectacular M7 roughly 5 degrees off the tip of the scorpion's tail. As it is nearby, M4 is one of the largest, brightest globular clusters in the sky, visible even with binoculars.
M4 (globular cluster)
M6 The Butterfly Cluster (open cluster)
M7 Ptolemy's Cluster (open cluster)
M80 (globular cluster) ...
The Lagoon Nebula, M8, is just below center, while the open clusters M7 and M6 lie to the left of the Scorpion's lower tail. The center of the Galaxy lies down and to the right of M8.
See also: Star, Astro, Scorpius, Cluster, Sky